GPT-5 vs Grok 4.3 — Pricing Comparison 2026

Requests per Day

Days per Month

OpenAI

GPT-5

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

xAI

Grok 4.3

$0.00

per month

Input cost

Output cost

Cost per request

Requests/month

Which Model for Which Use Case?

Cost-Sensitive Workloads

Grok 4.3 matches GPT-5 on input price but is 75% cheaper on output. For high-output workloads like content generation or code completion, Grok 4.3 delivers significant savings.

Best value: Grok 4.3 (75% cheaper output)

Long-Context Processing

Grok 4.3's 1M context window is 3.7x larger than GPT-5's 272K. For processing lengthy documents or maintaining large conversation histories, Grok 4.3 gives you significantly more room.

Long context: Grok 4.3 (3.7x more)

Ecosystem Integration

GPT-5 benefits from OpenAI's extensive ecosystem — plugins, function calling, and a wide range of third-party tools. If your stack is built on OpenAI, GPT-5 offers the smoothest path.

Ecosystem: GPT-5 | Budget output: Grok 4.3

Global Availability

GPT-5 has OpenAI's global infrastructure with availability across all regions. Grok 4.3 from xAI is growing but has more limited deployment. For worldwide access, GPT-5 has the edge.

Global reach: GPT-5 | Value: Grok 4.3

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Frequently Asked Questions

Is Grok 4.3 cheaper than GPT-5?

Grok 4.3 costs $1.25/M input and $2.50/M output. GPT-5 costs $1.25/M input and $10.00/M output. Grok matches on input but is 75% cheaper on output. For a typical workload of 1M input + 500K output tokens/month, Grok costs $2.50 vs GPT-5's $6.25 — saving $3.75/month (60%).

Which has a larger context window, GPT-5 or Grok 4.3?

Grok 4.3 has a 1M token context window, which is 3.7x larger than GPT-5's 272K context. If you need to process long documents or maintain extensive conversation histories, Grok 4.3 offers significantly more room.

When should I choose GPT-5 over Grok 4.3?

Choose GPT-5 when: (1) you need OpenAI's ecosystem and integrations, (2) your workload fits within 272K context, (3) you want OpenAI's broader availability. Choose Grok 4.3 when: (1) cost efficiency on output matters (75% cheaper), (2) your workload requires more than 272K context, (3) you want xAI's platform.

Are GPT-5 and Grok 4.3 good for production use?

Both are production-ready. GPT-5 is OpenAI's flagship model with broad ecosystem support. Grok 4.3 from xAI offers competitive pricing at 75% less for output and a massive 1M context window. Both support enterprise-grade production workloads.